Transition planning and assessment should begin no later than a student's first year of high school and focus on the student's needs, preferences, and interests as they relate to working, educational, living, and social environments. Vocational assessment becomes more critical in transition planning as students prepare for post-secondary adjustment. Assessment should involve student choice, self-determination, and future-oriented decision making. Informal procedures like interest inventories, work samples, and portfolio assessments can be used to evaluate students' skills and progress over time.